Dynamo-electric machine.



No. 887,521. PATENTED MAY 12, 1908.

H. G. REIST.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED JAN. 24, 1903.

. JI|VII"INIIIIMIII IMIL INVENTD Henry G Heist.

UNITED STATES PATENT OFFICE.

HENRY G. REIST, OF SGHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOM- PANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed January 24, 1903. Serial No. 140,369.

T all whom it may concern:

Be it known that I, HENRY The pole pieces C have substantially par- G.RE1sT,a allel sides and shouldered horns 6 for the recitizen of theUnited States, reslding at ception of the spools of copper wire 7, and

Schenectady, county of Schenectady, of New York, have invented certainnew and useful Improvements in Dynamo-Electric Machines, of which thefollowing is a specification.

'My invention relates to dynamo electric machines, and especially to thehigh speed revolving field type.

It is well known that the factor which determines the size and speed ofthe more powerful dynamo electric machines is the capacity of therevolving parts to withstand the stresses produced therein by thecentrifugal forces, and that as these machines have been builtheretofore it has been impossible to run them at as high speeds as manyother kinds of machines of corresponding sizes have been driven.

The object of my invention is to provide a revolving field with itscomponent parts so interconnected that it will withstand the Theinvention will be more readily understood by reference to the accomanying drawing forming a part of this speci cation, in which Figure 1 isa top lan of a portion of a horizontally revolving held with the endlate removed and one of the pole pieces siown in section; Fig. 2 is aperspective view of a frag ment of the field core showing the lower endof a dovetailed recess with the friction plate and a key in position.

The central support of the revolving field consists of a spider A havingthe outer ends of its arms expanded in arcs of a circle and providedwith a plurality of dovetailed transverse grooves 1. The grooves 1 arespaced equidistantly, and are adapted to receive dovetailed projections2 from the inner edges of the laminae 3 constitutin the field core B.The laminae 3 are made in siiort sections and each is provided with twoor more dovetailed projections 2, and they are assembled so as to breakjoints, whereby a very strong and substantially continuous core isformed. The outer edges of the laminae 3 are shaped so as to form flatfaces 4 in the outer eriphery of the core B, and have dovetai edrecesses 5 cut therein for the reception of corresponding projectionsfrom the pole pieces O.

stress produced by greatly increased speeds.

State are composed of laminae 8 and end plates bolted together in theusual manner. The laminae 8 are each provided with two dovetailedprojections 9 corresponding to the dovetailed recesses 5 in the fieldcore, but of somewhat less extent to provide spaces for locking keys 10and 11 and friction strips 12. On account of the practical impossibilityto bring about exact registry of both projections 9 of a pole piece withtheir recesses 5, slots 13 are cut in the middle of the laminm 8 fromthe inner edges to near the outer edges to render them flexible, so thatboth projections 9 may be forced home in their respective recesses 5 bythe keys 10 and 11. The key 10 is made much thicker than key 11, thethin end of key 10 being substantially 1 equal to the thick end of key11, so as to provide sufficient stock to prevent swaglng of the smallend of key 10 when struck upon to remove the key. The slots 5 are formedin. the core laminae by punching, and as a consequence the sides of therecess formed thereby in the assembled core are more or less ragged andwould tend to cut the surface of key 10 if driven in contact therewith;in order to prevent such cutting action I provide a thin friction strip12 between the side of the recess and the driven key 10.

The pole pieces O with their coils of copper wire often weigh sevenlthousand pounds each, and accordingly render their assemblage with thecore B more or less diflicult. In order to facilitate the assemblage ofthese parts I provide means for arresting and supporting the pole piecesO in proper relation to the core B consisting of steps or stops locatedat the lower ends of the recesses 5 in the core B upon which theprojections 9 of the pole pieces and the stationary keys 11 may restwhile the keys 10 are being driven home. These steps are formed byomitting the notches 5 in the lowermost laminae of the core B, or byproviding only small slots 14; for the passage therethrough of drivenkeys 9 and the friction strips 12, as indicated in While I have shown myinvention as applied to a particular form of dynamo, it is apparent thatit is in no Way restricted thereto, and it is capable of many changesand modifications Without departing from its spirit or scope.

WVhat I claim as new, and desire to secure by Letters Patent of theUnited States, is,

1. The combination of a rigid core and a flexible pole piece connectedthereto by a plurality of dovetail joints.

2. The combination of a rigid core and a pole piece slotted transverselyand connected thereto by a pair of dovetail joints, located one on eachside of the transverse slot.

3. The combination of a laminated core, a laminated pole piece connectedthereto by an interlocking joint, keys to lock said joint, and means toprevent the laminae from cutting said keys.

4. The combination of a recessed core, pole pieces provided withprojections adapted to enter said recesses, and steps provided at theends of said recesses to support said pole pieces.

5. In combination, a rigid core member and a flexible pole piece member,one of said members being provided with a pair of dovetail recesses, andthe other of said members being provided with a pair dovetailprojections.

6. In combination, a core member, a pole piece member formed in two mainparts flexibly connected together, and separate means for securing eachof said parts to the core member.

7. In combination, a recessed core, a pole piece provided with aprojection which enters a recess in said core, a stop located at one endof said recess whereby the passage of the projection of the pole piecethrough the recess is prevented, and a locking device for securing theprojection 011 the pole piece in the recess, said stop being formed sothat it does not interfere with the insertion of the locking device inthe recess from either end thereof.

In witness whereof I have hereunto hand. this 23rd day of January, 1903.

HEN RY G. REIST.

of corresponding set my Vitnesses:

BENJAMIN B. HULL, HELEN ORFORD.

